How do I put a book on hold?
You can do that directly from the online catalog. Find the item you want in the catalog. Next to the title you will see a green button that says "Place a Hold." When you click on that, it will cue you to enter your library barcode and PIN (if you have forgotten your PIN, click on "Forgot Your PIN?," and if you have an email listed in your library account, you will receive a link where you can reset it), and also give you the opportunity to confirm where you would like to pick up the item.
I hope this answers your question! Let me know if you need more help.